Enhancement of the Thermal Performance of a Single Turn Pulsating Heat Pipe by Adding Micro-Coppers into the Base Fluid

Document Type : Research Article


1 Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, I. R. IRAN

2 Department of Mechanical Engineering, Sharif University of Technology, Tehran, I.R. IRAN

3 Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, I.R. IRAN


In this research, a series of experimental and numerical studies on the thermal performance of a single-turn Pulsating Heat Pipe (PHP) using distilled water as base fluid and distilled water including micro-coppers were performed. Thermal resistance, average temperatures of the hot region (evaporator), average temperatures of the cold part (condenser), and two-phase flow regime of the system were investigated at the different filling ratios, at input powers (20, 30, 40, 50 and 60W), at a concentration of micro-coppers (0.0625 g/mL). The oscillating heat pipe was fabricated with a copper capillary tube by choosing the internal and external diameters of 4 mm and 6 mm, respectively. Experiments showed adding micro-coppers into base fluid improves the main mechanism of the PHP based on the oscillating motion of vapor plugs and liquid slugs. The lowest thermal resistance of the system at a filling ratio of 40%, at a concentration of micro-coppers (0.0625 g/ml), at heat input (60 W) was 0.95 deg C/W. Meanwhile, CFD results illustrated adding micro-coppers into base fluid increases the turbulence intensity of the system especially in the evaporator up to 45% which enhances the heat transfer through the PHP in comparison to base fluid.


Main Subjects

[1] Lim J., Kim S.J., Fabrication and Experimental Evaluation of A Polymer-Based Flexible Pulsating Heat Pipe, Energy Conversion And Management, 56: 358-364 (2018).
[2] Zhou W., Li Y., Chen Z., Deng L., Gan Y., A Novel Ultra-Thin flattened heat Pipe with Bioporous Spiral Woven Mesh Wick for Cooling Electronic Devices, Energy Convers Manage, 180:769-783 (2019).
[4] Maydanik Y.F., Dmitrin V.I., Pastukhov VG., Compact Cooler for Electronics on The Basis of a Pulsating Heat Pipe, Appl. Therm. Eng, 29:  3511–3517 (2009).
[5] Burban G., Ayel V., Alexandre A., Lagonotte P., Bertin Y., Romestant C., Experimental Investigation of a Pulsating Heat Pipe for Hybrid Vehicle Applications, Appl. Therm. Eng, 50: 94–103 (2013).
[6] Cecere A., Cristofaro DD., Savino Replace., Ayel V., Sole-Agostinelli T., Marengo M., Romestant C., Bertin Y., Experimental Analysis of a Flat Plate Pulsating Heat Pipe with Self Rewetting Fluids During a Parabolic Flight Campaign, Acta Astronautica, (2018).
[7] Clement J., Wang X., Experimental Investigation of Pulsating Heat Pipe Performance with Regard to Fuel Cell Cooling Application, Applied Thermal Engineering, 50: 268-274 (2013).
[8] Khandekar S., Panigrahi P.K., Lefevre F., Bonjour J., Local Hydrodynamics of Flow in a Pulsating Heat Pipe: A Review, Front Heat Pipes, 1: 1-20 (2010).
[9] Yang H., Khandekar S., Groll M., Performance Characteristics of Pulsating Heat Pipes as Integral Thermal Spreaders, Int. J. Therm. Sci, 48: 815-824 (2009).
[10] Rao M., Lefevre F., Khandekar S., Bonjour J., Understanding transport of a Self-sustained thermally driven Oscillating Two-Phase System in a Capillary Tube, J. Heat Transfer, 65: 451-459 (2013).
[11] Nazari M.A., Ghasempour R., Ahmadi M.H., Heydarian G., Shafii M.B., Experimental Investigation of Graphene Oxide Nanofluid on Heat Transfer Enhancement of Pulsating Heat Pipe, International Communications in Heat and Mass Transfer, 91: 90-94 (2018).
[14] Suresh J.V., Bhramara P., Navaneeth C.H., Effect of Filling Ratio on Thermal Characteristics and Performance of a Pulsating Heat Pipe, IJITEE, 3341-3345 (2019).
[15] Riehl R.R., Santos N.D., Water-Copper Nanofluid Application in an Open Loop Pulsating Heat Pipe, Appl. Therm. Eng, 42: 6–10 (2012).
[16] Mohammadi M., Mohammadi M., Shafii M B., Experimental Investigation of a Pulsating Heat Pipe Using Ferrofluid (Magnetic Nanofluid), Journal of Heat Transfer, 134 (2012).
[17] Zufar M., Gunnasegaran P., Kumar H.M., Ng K.C., Numerical and Experimental Investigations of Hybrid Nanofluids on Pulsating Heat Pipe Performance, International Journal of Heat and Mass Transfer, 146 (2020).
[18] Noh H.G., Kim S.J., Numerical Simulation of Pulsating Heat Pipes: Parametric Investigation and Thermal Optimization, Energy Conversion and Management, 203 (2020).
[19] Wang S.F., Lin Z.R., Zhang L.W., Numerical Simulation on Flow and Heat Transfer in Oscillation Heat Pipes, IHPS, 6-9 (2011).
[20] Kim B., Li L., Kim J., Kim D., A Study on Thermal Performance of Parallel Connected Pulsating Heat Pipe, Applied Thermal Engineering, 126: 1063-1068 (2017).
[21] Meija J., Coplen T.B., Berglund M., Brand W.A., Bievre P.D., Groning M., Holden N.E., Irrgeher J., Loss R.D., Walczyk T., Prohaska T., Atomic Weights of The Elements 2013 (IUPAC Technical Report), Pure and Applied Chemistry, 88: 265-291 (2016).
[22] Holman J.P., Experimental Methods for Engineers, 7th ed., McGraw-Hill, New York, (2001).